I had a coolant leak (drip) that looked like it was coming from the bellhousing, but was actually coming from a heater hose and running down the block, and only when I had it plugged in at night. Initially it was that coolant hose behind the turbo that AEdelheit mentioned, then later it was from one of the Ts that I put in when I added a coolant filter.I will re-inspect
But with a mirror or inspection camera you should be able to see that one leakingThere is also the infamous freeze plug on the backside of the block.